/Engine/Source/Runtime/Engine/Classes/Engine/NetworkObjectList.h
If info cannot be found or created, nullptr will be returned.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNetworkObjectInfo](API\Runtime\Engine\Engine\FNetworkObjectInfo) > * FindOrAdd ( [AActor](API\Runtime\Engine\GameFramework\AActor) *const Actor, [UNetDriver](API\Runtime\Engine\Engine\UNetDriver) * NetDriver, bool * OutWasAdded )